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Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Short-term investments |  |
Amortized Cost | $ 97,093 |
Unrealized Gains | 17 |
Unrealized Losses | (7) |
Aggregate Fair Value | 97,103 | $ 0
Cash equivalents |  |
Carrying Value | 22,858 |
Total marketable securities, Amortized Cost | 119,951 |
Total marketable securities, Unrealized Gains | 17 |
Total marketable securities, Unrealized Losses | (7) |
Total marketable securities, Aggregate Fair Value | 119,961 |
U.S. treasury securities |  |
Short-term investments |  |
Amortized Cost | 65,491 |
Unrealized Gains | 2 |
Unrealized Losses | (4) |
Aggregate Fair Value | 65,489 |
Cash equivalents |  |
Carrying Value | 1,000 |
Corporate bonds |  |
Short-term investments |  |
Amortized Cost | 19,708 |
Unrealized Gains | 15 |
Unrealized Losses | (3) |
Aggregate Fair Value | 19,720 |
Commercial paper |  |
Short-term investments |  |
Amortized Cost | 11,894 |
Unrealized Gains | 0 |
Unrealized Losses | 0 |
Aggregate Fair Value | 11,894 |
Cash equivalents |  |
Carrying Value | 6,635 |
Money market funds |  |
Cash equivalents |  |
Carrying Value | $ 15,223 | $ 22,100

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